Half to ferdinand johnson



' (No Model) H. KNOWLTON. CHAIN GEARING.

Patented Sept. 29, 1885.

W/MM

UNITED STATES PATENT OFFICE.

HENRY KNOVLTON, OF VEST BAY CITY, MICHIGAN, ASSIGNOR OF ONE- HALF TOFERDINAND JOHNSON, OF SAME PLACE.

CHAlN-GEARING.

SPECIFICATION forming part of Letters Patent No. 327.446, datedSeptember 29, 1885.

(N0 model.)

To all whom, it may concern.-

Be it known that I, HENRY KNOWLTON, of West Bay City, in the county ofBay and State of Michigan, have invented new and useful Improvements inGhaii1-Gearing; and I do hereby declare that the following is a full,clear, and exact description thereof, reference being had to theaccompanying drawings, which form a part of this specification.

The invention relates to a new and useful improvement in chain-gearing;and the invention consists in the peculiar construction of a curved-linkchain, in combination with cogwheels adapted to operate in connectiontherewith, all as hereinafter described.

In the drawings which accompany this specification, Figure 1 is plan ofmy improved curved-link chain -gear. Fig. 2 is an edge view of thechain. Fig. 3 is a diagram illustrating the construction oflink andgear-wheel.

A are the curved links of which the chain is composed. These links arepivotally connected by pins in the usual alternating series of one andtwo, or two and three, or three and four, &c., as the required strengthof the chain demands. All thelinks are formed alike and areinterchangeable, and consist preferably of steel-plate stamped out inthe form required, or forged by the use of dies, so as to get them allalike. All the links are curved, as shown, so that the chain forms uponits inner side a flexible rack, the teeth of which form half of acircle, and are connected to-.

a link, as in Fig. 3, (the points a 01,) and construct over this line,as one of the sides, a regular polygon of such a number of sides asrequired to obtain a cog-wheel of suitable size. The corners of thispolygon mark the centers for the interdental spaces between the cogs,and by dividing each side into four parts, as shown in Fig. 3 by thedivisions b c d, the center of the half-circular cogs, their radius, andthe junction with the interdental spaces are found, and the cog-wheelmay be easily described.

The advantage of such a chain is that all the wear in operation isuniformly distributed, especially by using cog-wheels with an odd numberof cogs, so that the same cogs do not always engage with the same seriesof links. Another advantage is that the pivotal pins of the links, whichare especially liable to wear while the drive-chains are bent aroundcogwheels or sprocket wheels under a heavy strain, do not wear at all,or very little, with this form of chain-gear, as the pins are relievedfrom their strain by the interlocking of the chain and gear'wheel cogs.

Vhat I claim as my invention is- In a chain-gear, the combination of achain formed of a series of like-curved links with half-circular endsconnected by half-circular bends of the same radius between the ends,and pivoted together to form a flexible rack, with a cog-wheel havinghalf-circular cogs and halfcircular indentations between the cogs oflike radius and corresponding to the curved links of the chain,substantially as described.

HENRY KNOWVLTON.

Witnesses:

H. S. SPRAGUE, E. J. SoULLY.

